drivers/gpu/drm/nouveau/nouveau_acpi.c

   1 #include <linux/pci.h>
   2 #include <linux/acpi.h>
   3 #include <linux/slab.h>
   4 #include <acpi/acpi_drivers.h>
   5 #include <acpi/acpi_bus.h>
   6 #include <acpi/video.h>
   7 #include <acpi/acpi.h>
   8 #include <linux/mxm-wmi.h>
   9
  10 #include "drmP.h"
  11 #include "drm.h"
  12 #include "drm_sarea.h"
  13 #include "drm_crtc_helper.h"
  14 #include "nouveau_drv.h"
  15 #include "nouveau_drm.h"
  16 #include "nv50_display.h"
  17 #include "nouveau_connector.h"
  18
  19 #include <linux/vga_switcheroo.h>
  20
  21 #define NOUVEAU_DSM_LED 0x02
  22 #define NOUVEAU_DSM_LED_STATE 0x00
  23 #define NOUVEAU_DSM_LED_OFF 0x10
  24 #define NOUVEAU_DSM_LED_STAMINA 0x11
  25 #define NOUVEAU_DSM_LED_SPEED 0x12
  26
  27 #define NOUVEAU_DSM_POWER 0x03
  28 #define NOUVEAU_DSM_POWER_STATE 0x00
  29 #define NOUVEAU_DSM_POWER_SPEED 0x01
  30 #define NOUVEAU_DSM_POWER_STAMINA 0x02
  31
  32 #define NOUVEAU_DSM_OPTIMUS_FN 0x1A
  33 #define NOUVEAU_DSM_OPTIMUS_ARGS 0x03000001
  34
  35 static struct nouveau_dsm_priv {
  36         bool dsm_detected;
  37         bool optimus_detected;
  38         acpi_handle dhandle;
  39         acpi_handle rom_handle;
  40 } nouveau_dsm_priv;
  41
  42 #define NOUVEAU_DSM_HAS_MUX 0x1
  43 #define NOUVEAU_DSM_HAS_OPT 0x2
  44
  45 static const char nouveau_dsm_muid[] = {
  46         0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
  47         0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4,
  48 };
  49
  50 static const char nouveau_op_dsm_muid[] = {
  51         0xF8, 0xD8, 0x86, 0xA4, 0xDA, 0x0B, 0x1B, 0x47,
  52         0xA7, 0x2B, 0x60, 0x42, 0xA6, 0xB5, 0xBE, 0xE0,
  53 };
  54
  55 static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
  56 {
  57         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
  58         struct acpi_object_list input;
  59         union acpi_object params[4];
  60         union acpi_object *obj;
  61         int i, err;
  62         char args_buff[4];
  63
  64         input.count = 4;
  65         input.pointer = params;
  66         params[0].type = ACPI_TYPE_BUFFER;
  67         params[0].buffer.length = sizeof(nouveau_op_dsm_muid);
  68         params[0].buffer.pointer = (char *)nouveau_op_dsm_muid;
  69         params[1].type = ACPI_TYPE_INTEGER;
  70         params[1].integer.value = 0x00000100;
  71         params[2].type = ACPI_TYPE_INTEGER;
  72         params[2].integer.value = func;
  73         params[3].type = ACPI_TYPE_BUFFER;
  74         params[3].buffer.length = 4;
  75         /* ACPI is little endian, AABBCCDD becomes {DD,CC,BB,AA} */
  76         for (i = 0; i < 4; i++)
  77                 args_buff[i] = (arg >> i * 8) & 0xFF;
  78         params[3].buffer.pointer = args_buff;
  79
  80         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
  81         if (err) {
  82                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
  83                 return err;
  84         }
  85
  86         obj = (union acpi_object *)output.pointer;
  87
  88         if (obj->type == ACPI_TYPE_INTEGER)
  89                 if (obj->integer.value == 0x80000002) {
  90                         return -ENODEV;
  91                 }
  92
  93         if (obj->type == ACPI_TYPE_BUFFER) {
  94                 if (obj->buffer.length == 4 && result) {
  95                         *result = 0;
  96                         *result |= obj->buffer.pointer[0];
  97                         *result |= (obj->buffer.pointer[1] << 8);
  98                         *result |= (obj->buffer.pointer[2] << 16);
  99                         *result |= (obj->buffer.pointer[3] << 24);
 100                 }
 101         }
 102
 103         kfree(output.pointer);
 104         return 0;
 105 }
 106
 107 static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
 108 {
 109         struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
 110         struct acpi_object_list input;
 111         union acpi_object params[4];
 112         union acpi_object *obj;
 113         int err;
 114
 115         input.count = 4;
 116         input.pointer = params;
 117         params[0].type = ACPI_TYPE_BUFFER;
 118         params[0].buffer.length = sizeof(nouveau_dsm_muid);
 119         params[0].buffer.pointer = (char *)nouveau_dsm_muid;
 120         params[1].type = ACPI_TYPE_INTEGER;
 121         params[1].integer.value = 0x00000102;
 122         params[2].type = ACPI_TYPE_INTEGER;
 123         params[2].integer.value = func;
 124         params[3].type = ACPI_TYPE_INTEGER;
 125         params[3].integer.value = arg;
 126
 127         err = acpi_evaluate_object(handle, "_DSM", &input, &output);
 128         if (err) {
 129                 printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
 130                 return err;
 131         }
 132
 133         obj = (union acpi_object *)output.pointer;
 134
 135         if (obj->type == ACPI_TYPE_INTEGER)
 136                 if (obj->integer.value == 0x80000002)
 137                         return -ENODEV;
 138
 139         if (obj->type == ACPI_TYPE_BUFFER) {
 140                 if (obj->buffer.length == 4 && result) {
 141                         *result = 0;
 142                         *result |= obj->buffer.pointer[0];
 143                         *result |= (obj->buffer.pointer[1] << 8);
 144                         *result |= (obj->buffer.pointer[2] << 16);
 145                         *result |= (obj->buffer.pointer[3] << 24);
 146                 }
 147         }
 148
 149         kfree(output.pointer);
 150         return 0;
 151 }
 152
 153 /* Returns 1 if a DSM function is usable and 0 otherwise */
 154 static int nouveau_test_dsm(acpi_handle test_handle,
 155         int (*dsm_func)(acpi_handle, int, int, uint32_t *),
 156         int sfnc)
 157 {
 158         u32 result = 0;
 159
 160         /* Function 0 returns a Buffer containing available functions. The args
 161          * parameter is ignored for function 0, so just put 0 in it */
 162         if (dsm_func(test_handle, 0, 0, &result))
 163                 return 0;
 164
 165         /* ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported. If
 166          * the n-th bit is enabled, function n is supported */
 167         return result & 1 && result & (1 << sfnc);
 168 }
 169
 170 static int nouveau_dsm_switch_mux(acpi_handle handle, int mux_id)
 171 {
 172         mxm_wmi_call_mxmx(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 173         mxm_wmi_call_mxds(mux_id == NOUVEAU_DSM_LED_STAMINA ? MXM_MXDS_ADAPTER_IGD : MXM_MXDS_ADAPTER_0);
 174         return nouveau_dsm(handle, NOUVEAU_DSM_LED, mux_id, NULL);
 175 }
 176
 177 static int nouveau_dsm_set_discrete_state(acpi_handle handle, enum vga_switcheroo_state state)
 178 {
 179         int arg;
 180         if (state == VGA_SWITCHEROO_ON)
 181                 arg = NOUVEAU_DSM_POWER_SPEED;
 182         else
 183                 arg = NOUVEAU_DSM_POWER_STAMINA;
 184         nouveau_dsm(handle, NOUVEAU_DSM_POWER, arg, NULL);
 185         return 0;
 186 }
 187
 188 static int nouveau_dsm_switchto(enum vga_switcheroo_client_id id)
 189 {
 190         /* perhaps the _DSM functions are mutually exclusive, but prepare for
 191          * the future */
 192         if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
 193                 return 0;
 194         if (id == VGA_SWITCHEROO_IGD)
 195                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_STAMINA);
 196         else
 197                 return nouveau_dsm_switch_mux(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_LED_SPEED);
 198 }
 199
 200 static int nouveau_dsm_power_state(enum vga_switcheroo_client_id id,
 201                                    enum vga_switcheroo_state state)
 202 {
 203         if (id == VGA_SWITCHEROO_IGD)
 204                 return 0;
 205
 206         /* Optimus laptops have the card already disabled in
 207          * nouveau_switcheroo_set_state */
 208         if (!nouveau_dsm_priv.dsm_detected && nouveau_dsm_priv.optimus_detected)
 209                 return 0;
 210
 211         return nouveau_dsm_set_discrete_state(nouveau_dsm_priv.dhandle, state);
 212 }
 213
 214 static int nouveau_dsm_get_client_id(struct pci_dev *pdev)
 215 {
 216         /* easy option one - intel vendor ID means Integrated */
 217         if (pdev->vendor == PCI_VENDOR_ID_INTEL)
 218                 return VGA_SWITCHEROO_IGD;
 219
 220         /* is this device on Bus 0? - this may need improving */
 221         if (pdev->bus->number == 0)
 222                 return VGA_SWITCHEROO_IGD;
 223
 224         return VGA_SWITCHEROO_DIS;
 225 }
 226
 227 static struct vga_switcheroo_handler nouveau_dsm_handler = {
 228         .switchto = nouveau_dsm_switchto,
 229         .power_state = nouveau_dsm_power_state,
 230         .get_client_id = nouveau_dsm_get_client_id,
 231 };
 232
 233 static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
 234 {
 235         acpi_handle dhandle, nvidia_handle;
 236         acpi_status status;
 237         int retval = 0;
 238
 239         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 240         if (!dhandle)
 241                 return false;
 242
 243         status = acpi_get_handle(dhandle, "_DSM", &nvidia_handle);
 244         if (ACPI_FAILURE(status)) {
 245                 return false;
 246         }
 247
 248         if (nouveau_test_dsm(dhandle, nouveau_dsm, NOUVEAU_DSM_POWER))
 249                 retval |= NOUVEAU_DSM_HAS_MUX;
 250
 251         if (nouveau_test_dsm(dhandle, nouveau_optimus_dsm,
 252                 NOUVEAU_DSM_OPTIMUS_FN))
 253                 retval |= NOUVEAU_DSM_HAS_OPT;
 254
 255         if (retval)
 256                 nouveau_dsm_priv.dhandle = dhandle;
 257
 258         return retval;
 259 }
 260
 261 static bool nouveau_dsm_detect(void)
 262 {
 263         char acpi_method_name[255] = { 0 };
 264         struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
 265         struct pci_dev *pdev = NULL;
 266         int has_dsm = 0;
 267         int has_optimus = 0;
 268         int vga_count = 0;
 269         bool guid_valid;
 270         int retval;
 271         bool ret = false;
 272
 273         /* lookup the MXM GUID */
 274         guid_valid = mxm_wmi_supported();
 275
 276         if (guid_valid)
 277                 printk("MXM: GUID detected in BIOS\n");
 278
 279         /* now do DSM detection */
 280         while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
 281                 vga_count++;
 282
 283                 retval = nouveau_dsm_pci_probe(pdev);
 284                 if (retval & NOUVEAU_DSM_HAS_MUX)
 285                         has_dsm |= 1;
 286                 if (retval & NOUVEAU_DSM_HAS_OPT)
 287                         has_optimus = 1;
 288         }
 289
 290         if (vga_count == 2 && has_dsm && guid_valid) {
 291                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 292                         &buffer);
 293                 printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",
 294                         acpi_method_name);
 295                 nouveau_dsm_priv.dsm_detected = true;
 296                 ret = true;
 297         }
 298
 299         if (has_optimus == 1) {
 300                 acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
 301                         &buffer);
 302                 printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
 303                         acpi_method_name);
 304                 nouveau_dsm_priv.optimus_detected = true;
 305                 ret = true;
 306         }
 307
 308         return ret;
 309 }
 310
 311 void nouveau_register_dsm_handler(void)
 312 {
 313         bool r;
 314
 315         r = nouveau_dsm_detect();
 316         if (!r)
 317                 return;
 318
 319         vga_switcheroo_register_handler(&nouveau_dsm_handler);
 320 }
 321
 322 /* Must be called for Optimus models before the card can be turned off */
 323 void nouveau_switcheroo_optimus_dsm(void)
 324 {
 325         u32 result = 0;
 326         if (!nouveau_dsm_priv.optimus_detected)
 327                 return;
 328
 329         nouveau_optimus_dsm(nouveau_dsm_priv.dhandle, NOUVEAU_DSM_OPTIMUS_FN,
 330                 NOUVEAU_DSM_OPTIMUS_ARGS, &result);
 331 }
 332
 333 void nouveau_unregister_dsm_handler(void)
 334 {
 335         if (nouveau_dsm_priv.optimus_detected || nouveau_dsm_priv.dsm_detected)
 336                 vga_switcheroo_unregister_handler();
 337 }
 338
 339 /* retrieve the ROM in 4k blocks */
 340 static int nouveau_rom_call(acpi_handle rom_handle, uint8_t *bios,
 341                             int offset, int len)
 342 {
 343         acpi_status status;
 344         union acpi_object rom_arg_elements[2], *obj;
 345         struct acpi_object_list rom_arg;
 346         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL};
 347
 348         rom_arg.count = 2;
 349         rom_arg.pointer = &rom_arg_elements[0];
 350
 351         rom_arg_elements[0].type = ACPI_TYPE_INTEGER;
 352         rom_arg_elements[0].integer.value = offset;
 353
 354         rom_arg_elements[1].type = ACPI_TYPE_INTEGER;
 355         rom_arg_elements[1].integer.value = len;
 356
 357         status = acpi_evaluate_object(rom_handle, NULL, &rom_arg, &buffer);
 358         if (ACPI_FAILURE(status)) {
 359                 printk(KERN_INFO "failed to evaluate ROM got %s\n", acpi_format_exception(status));
 360                 return -ENODEV;
 361         }
 362         obj = (union acpi_object *)buffer.pointer;
 363         memcpy(bios+offset, obj->buffer.pointer, len);
 364         kfree(buffer.pointer);
 365         return len;
 366 }
 367
 368 bool nouveau_acpi_rom_supported(struct pci_dev *pdev)
 369 {
 370         acpi_status status;
 371         acpi_handle dhandle, rom_handle;
 372
 373         if (!nouveau_dsm_priv.dsm_detected && !nouveau_dsm_priv.optimus_detected)
 374                 return false;
 375
 376         dhandle = DEVICE_ACPI_HANDLE(&pdev->dev);
 377         if (!dhandle)
 378                 return false;
 379
 380         status = acpi_get_handle(dhandle, "_ROM", &rom_handle);
 381         if (ACPI_FAILURE(status))
 382                 return false;
 383
 384         nouveau_dsm_priv.rom_handle = rom_handle;
 385         return true;
 386 }
 387
 388 int nouveau_acpi_get_bios_chunk(uint8_t *bios, int offset, int len)
 389 {
 390         return nouveau_rom_call(nouveau_dsm_priv.rom_handle, bios, offset, len);
 391 }
 392
 393 int
 394 nouveau_acpi_edid(struct drm_device *dev, struct drm_connector *connector)
 395 {
 396         struct nouveau_connector *nv_connector = nouveau_connector(connector);
 397         struct acpi_device *acpidev;
 398         acpi_handle handle;
 399         int type, ret;
 400         void *edid;
 401
 402         switch (connector->connector_type) {
 403         case DRM_MODE_CONNECTOR_LVDS:
 404         case DRM_MODE_CONNECTOR_eDP:
 405                 type = ACPI_VIDEO_DISPLAY_LCD;
 406                 break;
 407         default:
 408                 return -EINVAL;
 409         }
 410
 411         handle = DEVICE_ACPI_HANDLE(&dev->pdev->dev);
 412         if (!handle)
 413                 return -ENODEV;
 414
 415         ret = acpi_bus_get_device(handle, &acpidev);
 416         if (ret)
 417                 return -ENODEV;
 418
 419         ret = acpi_video_get_edid(acpidev, type, -1, &edid);
 420         if (ret < 0)
 421                 return ret;
 422
 423         nv_connector->edid = kmemdup(edid, EDID_LENGTH, GFP_KERNEL);
 424         return 0;
 425 }